Check the chain and oil it. Check the tyre pressures (36 front, 42 rear). Check the tyres for nails and correct depth. Check the lights are all working. Check oil level. Check brake and clutch fluid level (if it never changes, do it less often).
Every 4,000 miles:
Change the oil and oil filter. Check the brake pads for wear.
Every 12,000 miles:
Change the air filter. Change the brake and clutch fluid (actually, do this every 3 years, but I am assuming the average of 4,000 miles/year). Take calipers apart and clean them up.
Every 16,000 miles (or longer if you feel lucky)
Check and adjust the tappet clearance. Check rear suspension mount points. Check head bearings.
That should keep your bike in good working order. Clean it and add goodies whenever you feel like it.